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Quality Built Homes, Inc. Service and Maintenance Manual
Combustion Air
Furnaces we install in basements or in utility closets over crawl spaces include a combustion air
duct. The outside end of this duct is covered with a screen to minimize insect or animal from
entering the duct. Cold air coming in though this duct means it is functioning as it should.
Caution: Never cover or block the combustion air vent in any way. Outside air is needed to
supply the furnace with sufficient oxygen. Blocking the combustion air vent will cause the
furnace to draw air down the vent pipe and pull poisonous gases back into your home.
Ductwork Noise
Some popping or pinging sounds are the natural result of ductwork heating and cooling in
response to airflow as the system operates.
Filter
A clean filter will help to keep your home clean and reduce dusting chores. Remember to change
or clean the filter monthly. A clogged filter can slow airflow and cause cold spots in your home.
Although it takes less than one minute to change the filter, this is one of the most frequently
overlooked details of normal furnace care.
Gas Odor
If you smell gas, leave the house immediately and call 911.
Odor
A new heating system may emit an odor for a few moments when you first turn it on. An
established system may emit an odor after being unused for an extended time (such as after the
summer months if you do not use air conditioning). This is caused by dust that has settled in the
ducts and should pass quickly.
On-Off Switch
The furnace has an on-off blower switch. This switch looks like a regular light switch and is
located in a metal box outside the furnace. When turned off, this switch overrides all furnace
commands and shuts down the blower. This is usually done only when maintenance service is
being performed, although young children have been known to turn the furnace off using this
switch. (If your furnace is a high-efficiency model, it does not have a pilot or an on-off switch.)
Registers
Heat register covers are removable and adjustable. You are responsible for adjusting the dampers
in these covers to regulate the heat flow within the home. Registers in the rooms farther away
from the furnace will usually need to be opened wider.
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